Heavily modded Gates Dynamote 50's restored Mic Pre w/90+db of gain! (a la RCA op-6, Collins, Retro etc) tons of new features - Rack ears Included

The 1950’s Gates Dynamote Model MO-3777 Hotrod Microphone Preamplifier with rack ears. This is your studio’s secret weapon and your unique advantage! - POSSIBLY THE GREATEST STUDIO MIC PRE AMPLIFIER FOR SALE IN THE WORLD TODAY - This incredibly rare, super hi-gain, low noise unicorn has been fully restored, heavily modified (without drilling any new holes in the faceplate), a quiet noise floor and has headroom for days (over 90+db of overall gain). It doesn’t oscillate, even when cranked! Tons of modern features like DI input, line in, direct out, phantom power, etc. Iconic vintage tone from the golden age of iron with modern features and added custom mods, details and technical specs below. The restoration of this unit took over a year of work with the help of an extremely talented tech at Custom Audio Labs in KY. It has many new high end components swapped out, as you can see from the hi-res photos. After speaking with dozens of techs and internet broadcast groups all over the world, we found that not only does no schematic for this model exist, there are only a handful of MO-3777's in working order in known existence, yet the Gates MO-3777 specs higher than almost all other other Preamps. Because of the unique complexity in its topology, this unit was deemed too difficult to restore without a schematic (again, to which none exist), including the extensive Gates archives nor via any broadcast forums or similar typical resource conduits. It was deemed impossible to restore or modify without this elusive schematic yet I finally found the right tech for the job (I probably spent over 100 hours over the last 5 years just trying to hunt down a schem). I sent it to a couple world class techs and both said it can’t be done without a schematic. Thankfully, I found the best tech on planet earth who made magic out of this unit and breathed all new life into it WITHOUT a schematic. MO-3777 SPECS AND DETAILS: - The top two Line Output terminals provide Broadcast/Telco standard of +8dBv output at Zero dbu on the VU meter. - The two lower PA Output terminals provide an output adjustable from -10 to +8 dBV into 10KOhms with the front panel PA Level control. - The front panel TRS is the same as the top two terminals, and is now balanced! An unbalanced TS plug may be used if ground loop hum is not an issue. - Microphone input #1 is now wired for Phantom Power! - Note the last pic of an aluminum Manley knob on a top mounted potentiometer on the read inside panel. This now allows you to dial in and calibrate the hum balance! * NOTE * When phantom power is turned ON, +48 volts is applied to the other two mic inputs through the input attenuator network, (so do not use a ribbon and a Phantom powered condenser at the same time). There is a Filament Balance / Hum null pot near the power transformer so you can calibrate this if you like (mostly when you change the tubes). It will ship pre-calibrated for you. For this reason, the shafts have been secured with a drop of nail polish (a Modern day Glyptal marker). OTHER MODIFICATIONS AND RESTORATION DETAILS: Custom Rack Ears were fabricated (shown in second pic) and included. It will be shipped with them pre-attached. Installed IEC power connector, professionally grounded the unit for quieter operation. Rewired and shielded chassis as necessary for safe operation Replaced components as necessary to restore proper operation. Many new capacitors and resistors. Cleaned controls, Daven potentiometers and connectors, replaced master level control Removed and disassemble VU meter, removed glass retainer clips from magnet assembly and repaired entirely. Cleaned glass, reinstalled clips, reassemble and reinstalled. Installed new TRS output jack, Built and Installed Phantom Power PSU and associated switch, indicator LED and wiring Modified input grounding to accommodate phantom power, installed new XLR-M output pigtail Installed new NOS hand selected audio grade tubes (best money can buy) Replaced missing chassis hardware, tighten chassis hardware, debugged and cleaned entire unit All I/O professionally and carefully cleaned with Deoxit. Pots all rebuilt with fader lube for dead quiet operation. Burn tested and final calibration. NEW PARTS: IEC power connector 48volt PSU module Power switch LED module XLR connector(s) TRS connector (10) High voltage electrolytics (3) Low voltage electrolytics (6) film caps (6) resistors Audio potentiometers Wire ties, new wiring, insulating material, tubes, hardware, TIME... etc. TECHNICAL SPECS: Overall maximum gain, Mic in to Line out: 94dB 6 stages of tube gain (!) Maximum output level at 1%THD: +15dBm Frequency response, level controls full CW, -3dB points. Mic in to line out: 24Hz to 18KHz Hi-Z in to line out: 11Hz to 25KHz Hi-Z Gain, for +15dBmn output: 90mV THD + Noise, Zero dBm output < .3% @ 1KHz Phantom Power: +48VDC through new matched resistors TUBE CHANGE OPERATION INSTRUCTIONS: Keep this info handy if you buy this…